Opera Unite doesn't use any encryption to protect your most important data. Now, for most people this is going to be fine. But if you wanted to share documents which contain information about how to admin your server or company accounts, then you may want to think again. On top of this, Opera Unite requires you to open and use an Opera account, where the data goes via their proxy server. You have to agree to this via the Opera Unite EULA and that you won't use the service to share data where you do not own the content (or a license to share your files). In theory, Opera could track the files and content you are sharing as it goes via their servers.
Opera Unite for Windows link.
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